最近在研究iOS程序的侧边栏，因为发现渐渐的iOS的程序也开始走侧边栏的风格了，QQ，今日头条，Path(Path算最早出现侧边栏的app了，所以也把侧边栏效果说成是Path效果)，所以就研究了下。
然后发现Git Hub上有很多侧边栏的控件，这些控件效果也都挺玄的，但是我想找到不用第三方控件自己实现侧边栏呢？后来参照这篇blog，然后自己搞了下，算搞清楚了。下面详细介绍一下吧。
1.
首先我们需要在storyboard里面新建3个view controlle，这里也可以是navigation controller，但是我还是习惯直接用view controller就可以了，跳转都自己来实现。
2.
接下来需要新建3个类，
ContainerViewController是一个容器类的VC，作用是放置MainVC和SideVC，就好比TabbarViewController一样，它只是一个容器，真正调整页面的是在其他VC中。
3.
先不用管这3个ViewController如何实现，我们转到storyboard中，分别把设置3个ViewController的identifier，像这个样子
ContainerViewController可以不设置storyboard，但是mainVC和sideVC一定要设置好storyboard ID，然后你还可以自己编辑一下Main VC和sideVC，这样可以更清晰地看到侧边栏的效果。
最终的StoryBoard是这样的：
最上面是ContainerViewController，接下来从右到左分别是MainViewController和SideViewController。
4.
好了，接下来我们就开始coding把。我这里想要做的效果是滑屏或者点击mainVC左上角的按钮都可以打开侧边栏，然后当侧边栏显示的时候，滑屏或者点击右侧的mainVC，都能隐藏侧边栏。
我们一步一步来分析代码吧：
其实主要是ContainerViewController
ContainerViewController.h
// 这个相当于是容器的VC，里面存放主界面和侧边栏
#import <UIKit/UIKit.h>
#import "MainViewController.h"
#import "SideViewController.h"
@interface ContainerViewController : UIViewController<UIGestureRecognizerDelegate>{}
@property(nonatomic, strong) MainViewController *centerController;
@property(nonatomic, strong) SideViewController *leftController;
- (void)showSideView;
- (void)hideSideView;
@end
我们import了mainVC和sideVC，然后定义了两个property和两个method
ContainerViewController.m
//
#import "ContainerViewController.h"
@interface ContainerViewController ()
@end
@implementation ContainerViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
_centerController = (MainViewController *)[storyboard instantiateViewControllerWithIdentifier:@"MainViewController"];
_centerController.fatherViewController = self;
_leftController = (SideViewController *)[storyboard instantiateViewControllerWithIdentifier:@"LeftViewController"];
[self.view addSubview:_centerController.view];
[_centerController.view setTag:1];
[_centerController.view setFrame:self.view.bounds];
[self.view addSubview:_leftController.view];
[_leftController.view setTag:2];
[_leftController.view setFrame:self.view.bounds];
[self.view bringSubviewToFront:_centerController.view];
//add swipe gesture
UISwipeGestureRecognizer *swipeGestureRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
[swipeGestureRight setDirection:UISwipeGestureRecognizerDirectionRight];
[_centerController.view addGestureRecognizer:swipeGestureRight];
UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
[swipeGestureLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[_centerController.view addGestureRecognizer:swipeGestureLeft];
}
-(void) swipeGesture:(UISwipeGestureRecognizer *)swipeGestureRecognizer {
CALayer *layer = [_centerController.view layer];
layer.shadowColor = [UIColor blackColor].CGColor;
layer.shadowOffset = CGSizeMake(1, 1);
layer.shadowOpacity = 1;
layer.shadowRadius = 20.0;
if (swipeGestureRecognizer.direction == UISwipeGestureRecognizerDirectionRight) {
[self showSideView];
}
if (swipeGestureRecognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
[self hideSideView];
}
}
// 显示侧边栏，单独写成一个函数，供mainVC点击头像时调用
- (void)showSideView{
[_leftController.view setHidden:NO];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
if (_centerController.view.frame.origin.x == self.view.frame.origin.x || _centerController.view.frame.origin.x == -200) {
[_centerController.view setFrame:CGRectMake(_centerController.view.frame.origin.x+200, _centerController.view.frame.origin.y, _centerController.view.frame.size.width, _centerController.view.frame.size.height)];
}
[UIView commitAnimations];
}
- (void)hideSideView{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
if ( _centerController.view.frame.origin.x == 200) {
[_centerController.view setFrame:CGRectMake(_centerController.view.frame.origin.x-200, _centerController.view.frame.origin.y, _centerController.view.frame.size.width, _centerController.view.frame.size.height)];
}
[UIView commitAnimations];
// 最后调用防止出现白底
[_leftController.view setHidden:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
在viewDidload方法里面，我们从storyboard中获取到两个ViewController，注意我的sideviewcontroller起的名字是LeftViewController，也就是在storyboard ID里面要写成这个名字。
然后添加进去了滑屏手势，分别是向左滑和向右滑
接下里在滑屏的代理里面定义了滑屏的动作。这里为什么要把显示/隐藏sideview单独做成两个method呢？因为一会我们要实现在mainVC里面点击头像的时候能够调用ContainerVC里的这两个函数！
接下来看看MainVC如何实现吧
MainViewController.h
#import <UIKit/UIKit.h> @class ContainerViewController; @interface MainViewController : UIViewController - (IBAction)showSideView:(id)sender; @property (nonatomic, strong) ContainerViewController* fatherViewController; @end
注意这里用@class来引入ContainerVC，不在头文件里面#import是为了防止循环引用。
然后我们定义一个property，fatherViewController，它是一个ContainerViewController的实例。
showSideView的IBAction是头像那个button的点击动作。
MainViewController.m
#import "MainViewController.h"
#import "ContainerViewController.h"
@interface MainViewController ()
@end
@implementation MainViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
- (IBAction)showSideView:(id)sender {
[self.fatherViewController showSideView];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[self.fatherViewController hideSideView];
}
@end
这样在mainViewController的点击头像button的动作就能调用fatherViewController，也就是ContainerViewController里面的showSideView动作了。
touchesBegan是当点击mainViewController的时候，隐藏侧边栏的。
以为SideViewController都是在storyboard里面拖入控件完成的，所以不需要写什么代码。
当然，这里仅仅是左侧的侧边栏，想要看两侧的侧边栏方法，查阅这里。